CATION EXCHANGE IN ANHYDROUS ETHYLENEDIAMINE

1965 ◽  
Vol 43 (5) ◽  
pp. 1096-1101 ◽  
Author(s):  
Walter R. Heumann ◽  
Onil Dionne ◽  
Gilles Tremblay
Keyword(s):  
Aqueous Solutions ◽  
Cation Exchange ◽  
Alkali Metals ◽  
Cross Linking ◽  
Exchange Reactions ◽  
Degree Of Dissociation ◽  
Cation Exchangers ◽  
Low Degree ◽  
Acid Cation

The swelling of the strongly acid cation exchangers Dowex 50 W of various degrees of cross-linking is markedly less in ethylenediamine than in water. However, it is sufficient for exchange reactions to occur. In contrast with aqueous solutions, electrolytes dissolved in ethylenediamine cause the swelling to increase, which is attributed to the low degree of dissociation attainable in this solvent. This explanation is supported by the observation that in water slightly dissociated electrolytes also produce a slight increase in swelling. Exchange reactions were carried out successfully with the slightly cross-linked resin Dowex 50 W-X2. The bromide, ethoxide, aminoethoxide, and 2-aminoethylamide of lithium exchanged the latter cation with other alkali metals or tetrabutylammonium easily.

scholarly journals Cation exchange behavior during the redox switching of poly (3,4-ethylenedioxythiophene) films

2020 ◽  
Vol 24 (11-12) ◽  
pp. 3231-3244 ◽  
Author(s):  
Violeta-Tincuţa Gruia ◽  
Adriana Ispas ◽  
Igor Efimov ◽  
Andreas Bund
Keyword(s):  
Aqueous Solutions ◽  
Cation Exchange ◽  
Room Temperature ◽  
Molar Mass ◽  
Sodium Dodecylsulfate ◽  
Polymerization Rate ◽  
Pedot Film ◽  
Cation Exchangers ◽  
Redox Switching

Abstract Poly (3,4-ethylenedioxythiophene), PEDOT, films were synthesized at room temperature by potentiodynamic and potentiostatic step deposition in aqueous solutions containing EDOT monomer and LiClO4. In some solutions, the effect of small amounts of sodium dodecylsulfate, SDS, on the polymerization rate of EDOT and on the stiffness of the obtained PEDOT film was studied. The obtained PEDOT films were transferred in aqueous solutions containing cations with different molar mass, such as H+, Li+, Na+, K+, and Cs+. The apparent molar masses of the exchanged species during potentiodynamic experiments were determined by in situ microgravimetry. These measurements underlined the importance of the electrolyte chosen for electropolymerization process. It is known that SDS anions can be trapped inside the polymer layer during electropolymerization, providing them with a cation exchange behavior. However, even if the PEDOT films were deposited from an electrolyte without SDS, they still acted as cation exchangers.

Facile Synthesis of Colloidal Zn3X2 (X = P, As) Quantum Dots: Transformation into (InyZn1-y)3X2 via Cation-Exchange Reactions

Nanoscale ◽  
2021 ◽  
Author(s):  
Sang-Wook Kim ◽  
Seungmin Baek ◽  
Jin-Soo Ha ◽  
Sungwoo Kim
Keyword(s):  
Quantum Dots ◽  
Cation Exchange ◽  
Environmentally Friendly ◽  
Exchange Reactions ◽  
Facile Synthesis ◽  
Organometallic Precursor

We firstly synthesized uniform Zn3X2 (X=P, As) quantum dots (QDs) using stable, environmentally friendly zinc precursor instead of organometallic precursor such as Me2Zn or Et2Zn, and controlled the QD size...

scholarly journals Exchange Characteristics of Lead, Zinc, and Cadmium in Selected Tropical Soils

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Tope O. Bolanle-Ojo ◽  
Abiodun D. Joshua ◽  
Opeyemi A. Agbo-Adediran ◽  
Ademola S. Ogundana ◽  
Kayode A. Aiyeyika ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Tropical Soils ◽  
Exchange Capacity ◽  
Exchange Reactions ◽  
Soil System ◽  
Soil Systems ◽  
Wide Range ◽  
Lead Zinc ◽  
High Base

Conducting binary-exchange experiments is a common way to identify cationic preferences of exchangeable phases in soil. Cation exchange reactions and thermodynamic studies of Pb2+/Ca2+, Cd2+/Ca2+, and Zn2+/Ca2+were carried out on three surface (0–30 cm) soil samples from Adamawa and Niger States in Nigeria using the batch method. The physicochemical properties studies of the soils showed that the soils have neutral pH values, low organic matter contents, low exchangeable bases, and low effective cation exchange capacity (mean: 3.27 cmolc kg−1) but relatively high base saturations (≫50%) with an average of 75.9%. The amount of cations sorbed in all cases did not exceed the soils cation exchange capacity (CEC) values, except for Pb sorption in the entisol-AD2 and alfisol-AD3, where the CEC were exceeded at high Pb loading. Calculated selectivity coefficients were greater than unity across a wide range of exchanger phase composition, indicating a preference for these cations over Ca2+. TheKeqvalues obtained in this work were all positive, indicating that the exchange reactions were favoured and equally feasible. These values indicated that the Ca/soil systems were readily converted to the cation/soil system. The thermodynamic parameters calculated for the exchange of these cations were generally low, but values suggest spontaneous reactions.

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